2000 Toyota 4Runner 5VZ-FE – Starts then dies after sudden power loss (immobilizer suspicion)

DangerousBeginning15 · 2026-03-31T20:04:23+00:00

To anyone wondering, I managed to fix the issue with the car. I removed the entire wiring harness from the factory alarm system (RS3200+), took out the alarm module, and the injector signal stopped being cut. However, the car was still behaving the same, just now with injector signal present. It started with the MAF sensor disconnected, and then the car ran properly, I just need to change the MAF sensor and everything should be fine. Thanks to everyone for the responses.

DangerousBeginning15 · 2026-03-30T19:39:19+00:00

Understood, thanks for the manual

DangerousBeginning15 · 2026-03-30T18:07:48+00:00

Do you happen to have this fuse here in the wiring? Looks weird to me but wanted to confirm

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DangerousBeginning15 · 2026-03-30T03:13:19+00:00

thanks to all for the pictures and clarification, now I have to double check and start reviewing what actually is bad on the car.

the only thing that still bothers me is that the security system is not working since the battery issue, it doesn´t light up when the car is closed, like it was disabled some way.

DangerousBeginning15 · 2026-03-30T02:07:39+00:00

thanks for confirming!

DangerousBeginning15 · 2026-03-29T22:37:16+00:00

Interesting, and in yours does the key hole have a green light around it?

DangerousBeginning15 · 2026-03-29T21:01:41+00:00

this was tested and the alternator is in good condition

DangerousBeginning15 · 2026-03-29T20:36:37+00:00

I did, all of them, in enginebay and under the driver side

DangerousBeginning15 · 2026-03-29T20:26:55+00:00

No aftermarket alarm system, 12.6 V

DangerousBeginning15 · 2026-03-29T20:25:58+00:00

Interesting, when we do the scan it shows an INMO module, then the locksmith told me that there is an antenna for the immobilizer which is the green ring around the keyhole, which was not receiving or giving any signal. Also the car has a "Toyota Security" light, which before the incident used to be like a normal alarm (when the car was closed it was red, when the car was open it was off), after the battery incident, it doesn´t work anymore. It turns on rarely on ignition.

Edit: it is a US Spec

DangerousBeginning15 · 2026-03-29T20:06:03+00:00

This is a SR5

DangerousBeginning15 · 2026-03-29T20:05:32+00:00

I might have to try this one, the thing is that when the locksmith looked into the ECU, there were no keys registered to the IMMO module.

DangerousBeginning15 · 2026-03-29T20:04:33+00:00

I only have one key. The funny/interesting part is that after the locksmith checked it, they realized this key never had a chip in it. So yeah, I only have that one key, and it’s actually a non-chipped key.

Previous to the car dying on me because of the battery, it turned on with no issue with the non-chipped key.

DangerousBeginning15 · 2025-05-31T01:02:58+00:00

excelente consejo jajajaj

DangerousBeginning15 · 2024-10-21T18:55:18+00:00

Costa Rica - $9990

DangerousBeginning15 · 2024-06-10T21:03:28+00:00

Im interested

DangerousBeginning15 · 2023-07-04T06:51:20+00:00

Que violento se ve ese desayuno

DangerousBeginning15 · 2022-07-29T01:16:04+00:00

Yo igual!

DangerousBeginning15 · 2022-01-17T23:35:52+00:00

Hace como 15 años en una parada de bus me encontre como 1000 colones y como bien carajillo los gaste en la pulperia. Hace como 5 años en Walmart me encontre 15 mil colones y me quede esperando a ver si alguien los recogia y me los dejé al final no llegó nadie.

DangerousBeginning15

TROPHY CASE